Securely erasing data from hard drives and other media
Securely erasing data from hard drives and other media
http://blogs.techrepublic.com.com/secur ... ag=nl.e040
[quote]...There is a persistent myth to the effect that to securely delete everything from a hard drive one must overwrite it thirty-five times with random data. This myth arises from a superficial read and misunderstanding of Peter Gutmann’s 1996 paper, Secure Deletion of Data from Magnetic and Solid-State Memory. The truth of the matter, as presented in his paper, is that 35 random overwrites serves only to apply the necessary means of securely deleting data for any of several different drive technologies. A specific data storage technology only requires some lesser technique applied to ensure secure deletion.
Perhaps more interesting is the fact that, for the most modern hard drive technologies, a single complete overwrite of a drive with zeros should be sufficient. Part of the reason for this is the fact that data density on a drive is much greater than it used to be. In layman’s terms, “the bits are smaller
[quote]...There is a persistent myth to the effect that to securely delete everything from a hard drive one must overwrite it thirty-five times with random data. This myth arises from a superficial read and misunderstanding of Peter Gutmann’s 1996 paper, Secure Deletion of Data from Magnetic and Solid-State Memory. The truth of the matter, as presented in his paper, is that 35 random overwrites serves only to apply the necessary means of securely deleting data for any of several different drive technologies. A specific data storage technology only requires some lesser technique applied to ensure secure deletion.
Perhaps more interesting is the fact that, for the most modern hard drive technologies, a single complete overwrite of a drive with zeros should be sufficient. Part of the reason for this is the fact that data density on a drive is much greater than it used to be. In layman’s terms, “the bits are smaller
- technosaurus
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if you are doing this as a business - the time required to do the full wipe of machines to federal standards it is more cost effective to pull them all and melt them down.
randomize however many times you'd like with
dd if=/dev/urandom -of=/dev/sda
then zero out with
dd if=/dev/zero -of=/dev/sda
randomize however many times you'd like with
dd if=/dev/urandom -of=/dev/sda
then zero out with
dd if=/dev/zero -of=/dev/sda
Check out my [url=https://github.com/technosaurus]github repositories[/url]. I may eventually get around to updating my [url=http://bashismal.blogspot.com]blogspot[/url].
I have used DBAN the last few years, works great but does take around 2 hours usually to do a 100 gig drive, I usually start it then go do something else for a while.
http://www.dban.org/
http://www.dban.org/
- Colonel Panic
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- Joined: Sat 16 Sep 2006, 11:09
DBAN's always been good enough for me. Use the "autonuke" option from the command prompt (I think you have to type F2 first), and a 20 GB drive will be thoroughly wiped in about 2 hours.
EBAN's essentially the same software, but runs over a network so you can wipe several computers at once (more cost-effective for a business which has to securely erase a lot of hard drives, as opposed to someone like me who only wipes my own).
The program you linked to looks like Windows-only.
EBAN's essentially the same software, but runs over a network so you can wipe several computers at once (more cost-effective for a business which has to securely erase a lot of hard drives, as opposed to someone like me who only wipes my own).
The program you linked to looks like Windows-only.
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To all admins and moderators:
I posted today what I believed to be a perfectly reasonable and polite question to a post here in this thread and now see my post doesn't exist anymore nor the original post that I was responding to.
1. I would be surprised if the original post has been deleted by an admin/mod.
2. if my reply has been deleted as well then I consider that very heavy handed.
3. it would only be decent and respectful if whoever has deleted my message would have emailed me and told me why or said that in public.
I hope I am mistaken but if I am not then I fear this forum and its admin/mods have turned a very sad corner.
I posted today what I believed to be a perfectly reasonable and polite question to a post here in this thread and now see my post doesn't exist anymore nor the original post that I was responding to.
1. I would be surprised if the original post has been deleted by an admin/mod.
2. if my reply has been deleted as well then I consider that very heavy handed.
3. it would only be decent and respectful if whoever has deleted my message would have emailed me and told me why or said that in public.
I hope I am mistaken but if I am not then I fear this forum and its admin/mods have turned a very sad corner.
- AF Branden
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- Location: United States, WA
-
- Posts: 58
- Joined: Mon 21 Feb 2011, 00:13
- AF Branden
- Posts: 165
- Joined: Tue 15 Sep 2009, 10:17
- Location: United States, WA
If you want to be 100% sure the data is unretrievable check out the guide below:
http://www.dominopower.com/issues/issue ... 0001737002
http://www.dominopower.com/issues/issue ... 0001737002
[img]http://i56.tinypic.com/nwymax.png[/img]
Too complicated.
Below is the tool I use.
Works every time.
Dave.
Below is the tool I use.
Works every time.
Dave.
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old HDD them say one need to low level write over with 0 something several times but them say that very modern Terra byte ones are so dense that one only need to write once?
Where is the line then. 250GB is maybe too old so one need to write several times? Does it take hours most likely?
Where is the line then. 250GB is maybe too old so one need to write several times? Does it take hours most likely?
I use Google Search on Puppy Forum
not an ideal solution though
not an ideal solution though
Dave_G method is good one. I used it when I removed hdd`s from about 30 comps before they went to some recycling site.
It didnt take long, before the metal disk inside was something else as circular, flat plate. The covers dont protect from sledgehammer. And the job was done in 15 minutes. I can recommend. The pins were smashed all together also.
And you dont recognize the hdd as hdd after hammering.... instantly.
Security by obscurity....great disguise.
It didnt take long, before the metal disk inside was something else as circular, flat plate. The covers dont protect from sledgehammer. And the job was done in 15 minutes. I can recommend. The pins were smashed all together also.
And you dont recognize the hdd as hdd after hammering.... instantly.
Security by obscurity....great disguise.
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Big hammer is universal tool for solving any problem.Dave_G wrote:Too complicated.
Below is the tool I use.
Works every time.
Dave.
About erasing:
Modern HDDs have internal functions for erasing itself.
If we lock a HDD with user password then unlock it with master password,
all data will be sequentially erased. This is fastest way for erasing (in theory).
SUUM CUIQUE.